<!DOCTYPE html>
<html>

<head>
    <title>Popup</title>
    <style>
        body {
            width: 200px;
            padding: 10px;
        }
    </style>
</head>

<body>
    <h1>Hello, World!</h1>
    <button id="myButton">Click Me</button>
    <script src="popup.js"></script>
</body>

</html>